Denis Bilenko committed b79e8ac

add documentation for sleep's "ref" argument

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     If *seconds* is equal to or less than zero, yield control the other coroutines
     without actually putting the process to sleep. The :class:`core.idle` watcher
     with the highest priority is used to achieve that.
+    If *ref* is false, the greenlet running sleep() will not prevent
+    from exiting.
     hub = get_hub()
     loop = hub.loop